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https://issues.apache.org/jira/browse/TINKERPOP-3101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Xia closed TINKERPOP-3101.
-------------------------------
    Resolution: Duplicate

Closing this as duplicate, as it also relates to the semantics of union() and 
its behavior with drop(). Please feel free to re-open if there are additional 
issues around this case. 

> `union()` with a mutation step as the first option is changing the output
> -------------------------------------------------------------------------
>
>                 Key: TINKERPOP-3101
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-3101
>             Project: TinkerPop
>          Issue Type: Improvement
>          Components: process
>    Affects Versions: 3.7.1
>            Reporter: Dave Bechberger
>            Priority: Major
>
> When you use a `drop()` step as the first subtraversal it is impacting the 
> subsequent subtraversals.  In the example below I would have expected this to 
> return the `valueMap()` of the incoming solutions since this is a branch step.
>  
> {code:java}
>          \,,,/
>          (o o)
> -----oOOo-(3)-oOOo-----
> plugin activated: tinkerpop.server
> plugin activated: tinkerpop.utilities
> plugin activated: tinkerpop.tinkergraph
> gremlin> g = TinkerFactory.createModern().traversal()
> ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
> gremlin> g.V().union(drop(), valueMap())
> ==>[]
> ==>[]
> ==>[]
> ==>[]
> ==>[]
> ==>[] {code}



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